I may be extremely sceptical but what is to stop a lot of people who are anti this group joining and making such allegations? Two of these allegations are extremely similar with the same kind of profile names.
This one says the border force intercepted the parcel months ago, at which point they would have confiscated it immediately, if they knew what it was. But the police turn up three months afterwards to search a property without a search warrant. Also, having experience with mental health teams/crises teams, I doubt an ambulance team would have accompanied the police, on the off chance they were needed, when there was no evidence there was any emergency at that moment. Ambulance crews are stretched to breaking point here. If this was genuine, they would have advised the police to call them if they thought there was a need too, not waste taking a crew, three months after the SN was delivered, just in case!
This all sounds like scare mongering to me. One or two of these claims may be genuine but anyone can be on the internet and say or do anything for whatever motive. This does not sound genuine at all but it will scare people a lot, especially young people with not much experience of life/ or experience of how weird some on the internet can be.